Combination scale
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Solution Overview
Problem
Conventional combination scales face thermal management issues due to elevated internal temperatures, affecting weight sensor stability, and existing solutions like ventilation or Peltier devices often require additional components or increase costs.
Innovation Solution
A combination scale design utilizing an ejector system with compressed air for ventilation, eliminating the need for fans and ensuring a waterproof structure, where the air purge device maintains internal pressure higher than atmospheric pressure to prevent dust and water entry, effectively cooling the cabinet without additional heat sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If electrically-driven fans are used for ventilation, then the cabinet interior can be cooled, but fan motors become additional heat sources and waterproofing complexity increases
Solution Approach 1:
The patent removes the fan motor from the cabinet interior, extracting the heat source problem. Instead of using an electrically-driven fan inside the cabinet, the invention uses compressed air supplied from outside through an ejector, eliminating the need for in-cabinet motor housing and waterproofing while still achieving ventilation and cooling.
Solution Approach 2:
The patent employs pneumatic principles by using compressed air and an ejector mechanism to achieve ventilation without electrical motors inside the cabinet. The ejector utilizes the kinetic energy of compressed air to create a vacuum effect that draws hot air out, providing a non-electrical solution to the cooling problem.
2Temperature
If Peltier device is used for direct cooling, then the location and vicinity can be efficiently cooled, but hot air rises and rests in upper part requiring additional fan for ventilation
Solution Approach 1:
The patent combines the cooling and ventilation functions into a single system. Rather than using a Peltier device for localized cooling plus a separate fan for ventilation, the invention uses compressed air supplied to an ejector that simultaneously cools the cabinet interior and exhausts hot air, merging multiple functions into one integrated solution.
Solution Approach 2:
The ejector system is self-service in that it uses the compressed air supply to automatically create the vacuum effect needed for ventilation. The system utilizes the energy already available in the compressed air to drive the ventilation process without requiring additional motors or complex control systems.
3Device complexity
If compressed air is supplied to ejector for ventilation, then fan motors are eliminated and waterproofing is simplified, but compressed air supply infrastructure is required
Solution Approach 1:
The patent leverages the universality of compressed air infrastructure, which is commonly available in industrial plants for various purposes. By designing the ventilation system to use this already-present resource, the invention makes the scale adaptable to existing industrial environments without requiring dedicated ventilation infrastructure, thus enhancing installation flexibility.
4Temperature
If conventional ventilation systems are used, then cooling is achieved, but additional heat sources from motors and increased cost result
Solution Approach 1:
The patent converts the potentially harmful effect of hot air accumulation into a beneficial exhaust flow. By using the ejector to create a vacuum, the system not only removes hot air but also uses the pressure differential to drive the ventilation process, turning the heat problem into the driving force for air circulation without adding motor heat.
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
This solution provides efficient ventilation, maintaining a stable internal temperature and improving weighing accuracy by removing hot air without the need for fans, thus preventing thermal impacts on internal devices.
Implementation Method 1
an ejector to be supplied with compressed air to ventilate the cabinet
Implementation Method 2
an ejector to be supplied with compressed air from any of conventionally available compressors
Data Source
AI summary
This invention relates to a combination scale including an ejector to be supplied with compressed air to ventilate a central cabinet of the combination scale, wherein an interior of the central cabinet and a suction port of the ejector are connected to and communicating with each other.