Photoelectric Sensing Device With Double-Sealing Structure
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Solution Overview
Problem
Sensing devices for measuring fluid characteristics by a photoelectric method suffer from short sealing life and require frequent replacement of sealing elements due to corrosion and damage in harsh environments, leading to product leakage.
Innovation Solution
A sensing device with a double-sealing structure, comprising a first sealing structure using bonding, welding, or interference fit, and a second sealing structure with an elastic seal, such as an O-shaped elastomer, to enhance sealing performance in high temperature, high pressure, and corrosive conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single sealing structure is used in the sensing device, then the device can be simpler in structure, but the sealing life is short and the product is prone to leakage in corrosive, high temperature, and high pressure environments
Solution Approach 1:
The sealing structure is divided into two independent sealing elements: a first sealing element that seals between the window and the electrode head, and a second sealing element that seals between the diaphragm and the electrode head. Each sealing element independently addresses specific sealing needs, allowing the system to achieve reliable long-term sealing in harsh environments while maintaining reasonable structural complexity through functional division.
2Reliability
If a double-sealing structure is implemented to improve sealing reliability, then the product has high air tightness and long-term stability, but the structure becomes more complex
Solution Approach 1:
The sealing function is segmented into two distinct sealing zones: the first sealing element handles the window interface, while the second sealing element handles the diaphragm interface. This segmentation allows each sealing element to be optimized for its specific function and location, achieving high reliability without excessive overall complexity.
Solution Approach 2:
Different sealing elements are applied at different locations based on local requirements: the first sealing element is positioned at the window interface where light transmission is critical, while the second sealing element is positioned at the diaphragm interface where pressure sealing is critical. Each sealing element has local quality optimized for its specific functional requirements.
Data Source
AI summary
A sensing device with a sealing structure for measuring fluid characteristics by a photoelectric method is disclosed. The sensing device includes an electrode head having an outer side which contacts a fluid to be measured and one or more windows arranged in respective window openings which extend between an inner and an outer face of a wall of the electrode head. At least two sealing structures seal the one or more windows and the respective window openings. A first of the at least two sealing structures is bonded, welded, or provides an interference fit. The sensing device can be used to seal the product in high temperature, high pressure, and corrosive environment, so that the product has high air tightness and is stable and reliable for a long time. In addition, the sealing structure of the product is easy to clean.