Weighing Pan Sealing Structure for Stable Waterproof Measurement
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Solution Overview
Problem
Existing waterproof mechanisms for weighing apparatuses using diaphragms or rubber caps are bulky, unstable due to pressure fluctuations, and require dedicated jigs that are prone to loss and management inconveniences.
Innovation Solution
A waterproof mechanism that engages a weighing pan with a pan boss circumferential member using threaded or concavo-convex engagements, combined with waterproofing materials, to prevent water intrusion without needing a diaphragm or dedicated jig.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a diaphragm is used to cover the junction portion for constant waterproofing, then waterproofing reliability is improved, but the apparatus size increases and measurement precision deteriorates due to pressure fluctuations
Solution Approach 1:
The invention removes the diaphragm component from the system entirely. Instead of using a diaphragm to cover the junction portion, the patent employs a sealing member that directly seals the junction between the weighing pan and the case, eliminating the source of pressure-induced measurement errors while maintaining waterproofing functionality.
Solution Approach 2:
The sealing function is segmented into distinct components: a sealing member with a sealing portion that specifically targets the junction portion between the weighing pan and case. This segmentation allows the sealing function to be performed without requiring a diaphragm, thus avoiding measurement precision issues while maintaining waterproofing reliability.
2Reliability
If a rubber cap or pneumatic jig is used for waterproofing during cleaning, then waterproofing reliability is improved, but device complexity increases and ease of operation deteriorates due to management requirements
Solution Approach 1:
The sealing member is integrated into the weighing pan structure itself, serving as a permanent waterproofing solution that eliminates the need for separate rubber caps or pneumatic jigs. The sealing member performs the waterproofing function continuously during both weighing and cleaning operations, simplifying the overall system and improving ease of operation.
Solution Approach 2:
The weighing pan structure includes built-in sealing features (sealing groove and sealing member) that automatically provide waterproofing during cleaning operations without requiring external jigs or caps. The structure is designed to work with the cleaning process itself, eliminating the need for additional management of separate waterproofing components.
3Reliability
If a diaphragm is used to cover the junction portion, then waterproofing reliability is improved, but the apparatus size increases
Solution Approach 1:
The invention extracts and removes the diaphragm component from the system. The junction portion is sealed directly using a sealing member integrated into the weighing pan and case structure, eliminating the need for additional space required by a diaphragm while maintaining waterproofing reliability.
Data Source
AI summary
Provided is a waterproof mechanism that waterproofs a mass sensor of a weighing apparatus without using a diaphragm or a dedicated jig. A waterproof mechanism (20) for a weighing apparatus includes a weighing pan (11), a mass sensor (12) to which a load of the weighing pan is transmitted, a device case (10) configured to house the mass sensor, a pan boss (14) configured to support the weighing pan higher than the device case, and a pan boss circumferential member (13) provided in a circumferential direction of the pan boss and fixed to the device case, wherein the weighing pan includes a side wall portion (112) provided continuously downward from a pan portion rim, and when the weighing pan is lowered downward by a prescribed amount, the side wall portion engages with the pan boss circumferential member in the circumferential direction, and a lower surface (1111) of the pan portion and an upper surface (1321) of the pan boss circumferential member come into contact with each other.