Pressure Sensor Drainage Hole Design for Water Discharge
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Solution Overview
Problem
Conventional pressure sensors face challenges in effectively draining water from their pressure introduction holes, leading to restricted functionality due to inadequate drainage properties.
Innovation Solution
The pressure sensor design incorporates a pressure introduction hole with a first introduction hole and a second introduction hole, where the angle between their wall surfaces is greater than or equal to 90°, and a space increasing chamber is added to the second introduction hole, increasing its length and enhancing the drainage by increasing the force of inertia on any water droplets, allowing for easier discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the second introduction hole is extended to increase drainage length, then water drop drainage property is improved, but the device complexity increases
Solution Approach 1:
The pressure introduction hole is segmented into multiple sections: a first introduction hole, a second introduction hole, and a space increasing chamber. This segmentation allows each section to serve a specific function - the extended second introduction hole provides drainage length while the space increasing chamber manages water drop displacement, resolving the contradiction between improved drainage and structural complexity.
Solution Approach 2:
The space increasing chamber is configured with an opening angle of 90 degrees or more, creating a dimensional expansion that increases the effective length of the second introduction hole without proportionally increasing overall device complexity. This dimensional change enables improved water drop drainage through increased inertia while maintaining reasonable structural complexity.
2Reliability
If the space increasing chamber is added to extend the second introduction hole, then the drainage property is improved, but the manufacturing complexity increases
Solution Approach 1:
The space increasing chamber is merged with the second introduction hole as an integrated structure formed in a single molding process. This combining of functions allows the extended drainage path and water drop displacement chamber to be manufactured together, reducing manufacturing complexity while achieving improved drainage properties.
Solution Approach 2:
The opening angle of the space increasing chamber is set to 90 degrees or more, which is a specific parameter change that optimizes water drop displacement while maintaining manufacturability. This parameter optimization allows the space increasing chamber to effectively extend the second introduction hole for better drainage without excessive manufacturing complexity.
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 design significantly improves the drainage properties of the pressure introduction hole, enabling efficient discharge of water droplets even under pulsation conditions, compared to conventional sensors.
Implementation Method 1
the length of the second introduction hole becomes long in the direction away from the second end opening. For this reason, when pulsation arises in pressure, if water drop exists in the second introduction hole, the water drop is displaced inside the second introduction hole. When the water drop reaches the second end opening after arriving at the end portion, the force of inertia applied to the water drop becomes large.
Data Source
AI summary
A pressure introduction hole of a case has a first introduction hole extended in a predetermined direction to define a first end opening and a second introduction hole extended in a direction different from the predetermined direction to define a second end opening opposite from the first end opening. The second introduction hole is communicated to the first introduction hole. An angle defined between a wall surface of the first introduction hole and located adjacent to the second end opening and a wall surface of the second introduction hole and connected to the wall surface of the first introduction hole is larger than or equal to 90°. The second introduction hole has a communication part communicating with the first introduction hole, and a space increasing chamber further extending from the communication part away from the second end opening.