Pressure Sensor Diaphragm Grooves for Insulating Liquid Filling
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Solution Overview
Problem
The downsizing of pressure sensors has resulted in a narrower space filled with insulating liquid, making it challenging to ensure complete filling of the housing with insulating liquid, which affects the temperature properties and performance of the sensor.
Innovation Solution
A pressure sensor design featuring a base with a first flow path and recess, a diaphragm with concentric grooves, and an adjustment member with a hole that introduces fluid into the recess, ensuring effective filling and minimizing air bubble formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the pressure sensor is downsized, then the sensor size is reduced, but the space filled with insulating liquid becomes narrower making it difficult to ensure complete filling
Solution Approach 1:
The diaphragm is divided into multiple segments by forming concentric grooves, which creates multiple fluid passages that facilitate complete filling of insulating liquid throughout the housing space, resolving the filling difficulty caused by downsizing
Solution Approach 2:
An adjustment member with a through-hole is introduced as an intermediary structure to control and regulate the filling process of insulating liquid, ensuring complete coverage even in the narrowed space of downsized sensors
2Quantity of substance
If the adjustment member is provided inside the housing, then the insulating liquid amount can be adjusted, but the filling process becomes more complex and air bubbles may remain
Solution Approach 1:
The adjustment member is pre-installed with the diaphragm before the final sealing process, creating a controlled filling pathway that allows insulating liquid to be introduced systematically and ensures complete filling while preventing air bubble entrapment
Solution Approach 2:
The concentric grooves on the diaphragm automatically guide the insulating liquid flow during filling, creating self-draining channels that eliminate air bubbles without requiring additional manual intervention or complex filling procedures
Data Source
AI summary
Embodiments provide a pressure sensor capable of surely filling inside of a housing in which an adjustment member is provided with insulating liquid. A base includes a first flow path to be filled with a first fluid and a first recess communicating with the first flow path. A first diaphragm seals the first recess. A sensor unit is provided in the first recess. An adjustment member is arranged around the sensor unit in the first recess, communicates with the first flow path, and includes a hole introducing the first fluid in the first flow path into the first recess. The first diaphragm includes a plurality of grooves arranged concentrically, and the hole is opposed to one of the plurality of grooves.