Vacuum Sealer Heating Sheet for Wide Direct-Mains Sealing
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Solution Overview
Problem
Existing vacuum sealers require voltage converters to heat the sealing devices, leading to high production costs, limited heating power, narrow sealing width, and poor sealing performance due to complex manufacturing and uneven heat distribution.
Innovation Solution
A vacuum sealer with a metal heating sheet directly connected to mains electricity, featuring a hollowed pattern for increased resistance, laminated with a high-temperature-resistant insulating film, and a thermosensitive resistor for temperature control, allowing direct heating without additional converters and achieving wide sealing widths and high heating power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a flat-shape metal heating strip is used, then the sealing width is narrow (2-3 mm), but the heating power is limited to about 120 watts due to low electrical resistance
Solution Approach 1:
The heating strip is segmented into multiple sections with different resistance characteristics. The first heating section has higher resistance for effective heating, while the second heating section has lower resistance for maintaining temperature, allowing the device to operate directly from mains electricity without voltage converters
Solution Approach 2:
Different regions of the heating strip are designed with different electrical resistance properties to serve different functions. The first heating section uses high resistance for power heating, while the second heating section uses low resistance for temperature maintenance, optimizing overall heating performance
2Reliability
If a metal heating wire pre-spiraled around an insulating rod is used, then the manufacturing becomes complex, but the heat transfer is poor and contact area with bag opening is reduced
Solution Approach 1:
The insulating rod is extracted from the heating wire structure, allowing the heating wire to be laid flat on the heating surface. This eliminates the complexity of spiraling the wire around a rod while improving heat transfer contact area with the bag opening
Solution Approach 2:
The heating wire transitions from a three-dimensional spiral structure around a rod to a two-dimensional flat layout on the heating surface. This dimensional change increases the contact area with the bag opening and improves heat transfer efficiency
3Power
If additional voltage converters and PCBA are added to control the heating strip, then the heating power can be controlled, but the production cost increases
Solution Approach 1:
The heating strip is designed to be self-regulating through its differential resistance sections. The first heating section automatically provides high power when needed, while the second heating section maintains temperature without requiring external voltage conversion or complex control circuits
Solution Approach 2:
The voltage converter and additional PCBA components are extracted from the system. The heating strip's inherent resistance characteristics enable direct control from mains electricity, simplifying the device structure and reducing production costs
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 solution provides superior sealing performance with a 5 to 12 mm sealing width, exceeding 150 W heating power, and efficient sealing temperatures of 150 to 200°C, reducing costs and improving reliability and stability.
Implementation Method 1
The metal heating sheet is formed with a hollowed pattern, shaping the metal heating sheet into one or more continuous, densely arranged curved wires to significantly increase electricity resistance
Implementation Method 2
The metal heating sheet is laminated with the high-temperature-resistant resin and insulating film to maintain structural integrity, providing thermal insulation and electrical isolation
Data Source
AI summary
Provided is a vacuum sealer, comprising a base and a cover, the cover being movably hinged to a rear edge of the base, the base being configured with a vacuum pump, a control circuit board, and a power cord, wherein the vacuum pump is electrically connected to the control circuit board; an upper vacuum chamber and a lower vacuum chamber, wherein the upper vacuum chamber corresponds to the lower vacuum chamber to form a heat-seal area when the cover is closed against the base, wherein the upper and lower vacuum chambers are each configured with a sealing gasket at their peripheries, respectively; a heating sheet assembly electrically connected to the control circuit board being positioned on a front edge of the base opposite to the hinged rear edge; a heat-seal strip being positioned on a front edge of the cover opposite to the hinged rear edge.