Sensor Component Sealing via O-Ring Mediator
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Solution Overview
Problem
Conventional sensor components for measuring device casing temperature have complex shapes due to protrusions and fine irregularities to prevent fluid infiltration, leading to increased resin usage and shape complications.
Innovation Solution
A sensor component with a simplified shape, featuring a sensor body made by two-component molding with a primary mold portion and a secondary mold portion, and a pair of O-rings arranged on the border portion to prevent fluid infiltration, where the O-rings are in contact with the mounting hole's inner surface, reducing fluid entry and heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protrusions and fine irregularities are provided on the outer surface of the primary mold portion to prevent fluid infiltration, then fluid infiltration is prevented, but the shape becomes complicated and resin amount increases
Solution Approach 1:
The patent introduces O-rings as intermediary sealing elements between the primary mold portion and secondary mold portion. These O-rings make close contact with the outer surface of the primary mold portion to seal the gap, preventing fluid infiltration without requiring the primary mold portion itself to have complex protrusions or irregularities. This mediator approach resolves the contradiction by transferring the sealing function from the mold portion structure to a dedicated sealing component.
Solution Approach 2:
The patent divides the sealing function into separate components: the primary mold portion maintains a simple cylindrical shape for easy manufacturing, while the O-rings provide the sealing function. This segmentation allows each component to be optimized independently - the mold portion for manufacturing simplicity and the O-rings for sealing effectiveness.
2Reliability
If protrusions and fine irregularities are provided on the outer surface of the primary mold portion to prevent fluid infiltration, then fluid infiltration is prevented, but the amount of resin in the primary mold portion increases
Solution Approach 1:
The O-rings serve as intermediary sealing elements that eliminate the need for resin to form protrusions or irregularities on the primary mold portion surface. By using these elastic sealing members, the patent reduces resin consumption while achieving reliable fluid infiltration prevention.
3Ease of manufacture
If the sensor body is made by two-component molding with a border portion, then manufacturing flexibility is improved, but fluid infiltration risk increases at the border portion
Solution Approach 1:
The patent uses flexible O-rings to seal the border portion between the primary mold portion and secondary mold portion. These elastic rings can deform to conform to the cylindrical outer surface of the primary mold portion, creating an effective seal at the junction where two different molding components meet, thus preventing fluid infiltration while maintaining manufacturing flexibility.
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 simplifies the shape of the sensor component, effectively prevents fluid infiltration, and reduces heat radiation between mold portions, enhancing its performance and reliability.
Implementation Method 1
a pair of O-rings arranged on the sensor body and capable of coming into close contact with an inner surface of the mounting hole
Implementation Method 2
the sensor body is made by two-component molding, wherein the sensor body includes a primary mold portion which is made by a primary molding and in which the detection means embedded; and a secondary mold portion which is made by a secondary molding
Data Source
AI summary
A sensor component to be press-fitted into a mounting hole includes a sensor body, detection means, and a pair of O-rings. The sensor body includes a primary mold portion in which the detection means is embedded, a secondary mold portion provided on an opposite side of the primary mold portion in the press-fitting direction of the mounting hole, and a border portion between the primary mold portion and the secondary mold portion. The primary mold portion includes a first arrangement portion on which one of the pair of O-rings is arranged. The secondary mold portion includes a second arrangement portion on which the other of the pair of O-rings is arranged. The second arrangement portion, the border portion, and the first arrangement portion are arranged in this recited order in the press-fitting direction.