Heat preservation appliance
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Solution Overview
Problem
Existing heat preservation appliances have short fresh-keeping times, leading to rapid food deterioration due to bacterial growth.
Innovation Solution
A heat preservation appliance with a check valve and evacuating device that creates a vacuum state in the inner container to inhibit bacterial growth, using a check valve with a silica gel valve body and sealing parts to maintain low pressure and prevent air leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional heat preservation appliances are used to maintain food temperature, then heat preservation is achieved, but fresh-keeping time is short and food deteriorates rapidly due to bacterial growth
Solution Approach 1:
The patent applies vacuum preservation by extracting air from the inner container to create a low-pressure or vacuum environment. This inert atmosphere prevents bacterial growth and oxidation, thereby extending the fresh-keeping time of food while maintaining its temperature. The vacuum state is achieved through an evacuating device connected to the inner container.
Solution Approach 2:
The patent changes the pressure parameter inside the inner container from atmospheric pressure to low pressure or vacuum state. This parameter change fundamentally alters the environment for food preservation, inhibiting bacterial growth and extending freshness duration while the heating element maintains the temperature parameter.
2Duration of action of moving object
If a vacuum state is created to prevent bacterial growth and extend fresh-keeping time, then fresh-keeping time is prolonged, but the device complexity increases due to the need for check valves and sealing mechanisms
Solution Approach 1:
The check valve is designed to automatically open when the internal pressure exceeds external pressure (during heating or filling) and automatically close when internal pressure drops below external pressure (during vacuum preservation). This self-regulating mechanism eliminates the need for complex control systems, sensors, or manual operation, thereby extending fresh-keeping time while minimizing the increase in device complexity.
Solution Approach 2:
The patent extracts only the essential function needed for vacuum preservation - the check valve that selectively allows air removal while preventing air ingress. By taking out only this critical component rather than implementing a complex active sealing system, the patent achieves extended fresh-keeping time with minimal added complexity.
3Duration of action of moving object
If air is extracted from the inner container to create a vacuum state for food preservation, then fresh-keeping time is extended, but air leakage must be prevented to maintain the vacuum state
Solution Approach 1:
The check valve automatically responds to pressure differential changes: it closes when internal pressure drops during vacuum extraction, preventing air leakage back into the container. This self-actuating mechanism ensures reliable vacuum state maintenance without requiring external control systems, sensors, or power sources, thereby extending fresh-keeping time while ensuring vacuum integrity.
Solution Approach 2:
The check valve provides passive feedback control by sensing the pressure differential across its structure. When internal pressure exceeds external pressure (during heating or filling operations), the valve opens to equalize pressure. When internal pressure drops below external pressure (during vacuum preservation), the valve automatically closes to maintain the vacuum state. This feedback mechanism ensures reliable vacuum maintenance for extended fresh-keeping.
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
Prolongs the fresh-keeping time of food by preventing bacterial growth through vacuum preservation, while maintaining heat preservation capabilities.
Implementation Method 1
the evacuating device extracts air in the first inner container through the check valve to keep the first inner container in a low pressure or vacuum state
Implementation Method 2
the check valve includes a valve body... two ends of the valve body are protruded in a radial direction to form a first sealing part
Data Source
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AI summary
The application discloses a heat preservation appliance, including: a box body provided with a first inner container; a cover body including an inner cover and an outer cover, wherein the inner cover covers the first inner container, the inner cover is provided with a check valve, the outer cover is connected to the box body, the outer cover is provided with an avoidance hole, and the avoidance hole is arranged corresponding to the check valve; and an evacuating device connected to the check valve through the avoidance hole, wherein the evacuating device extracts air in the first inner container through the check valve..