Air Flow Sensor Protective Projection for Mold Simplification
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Solution Overview
Problem
Conventional air flow measuring devices with L-shaped protection covers have complex mold structures and insufficient protective functions, as the protection wall ends inward of the temperature sensor, complicating resin-molding and providing inadequate protection.
Innovation Solution
An air flow measuring device with a housing, sensing part, temperature sensor, supporting member, and protective projection that projects outward from the housing, allowing for simple mold removal and effective protection of the temperature sensor by positioning the projection's end outward of the sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an L-shaped protection cover is used to protect the temperature sensor, then the protective function is improved, but the mold structure becomes complicated
Solution Approach 1:
The protection cover is segmented into a main body portion and a separate protective projection. The protective projection is designed to be formed by simple mold removal in one direction, while the main body provides the housing structure. This segmentation allows the protective function to be achieved without requiring a complex integrated mold structure.
Solution Approach 2:
The protective projection extends in a direction perpendicular to the main body of the protection cover, creating a three-dimensional protective structure. This dimensional extension provides enhanced protection for the temperature sensor while maintaining a simple mold structure, as the projection can be formed by straightforward mold removal rather than complex L-shaped geometry.
2Ease of manufacture
If the protection wall ends inward of the temperature sensor, then the mold structure is simpler, but the protective function becomes insufficient
Solution Approach 1:
The protective projection is designed to extend outward of the temperature sensor before insertion, providing preliminary protection against objects approaching the sensor. This preliminary protective action ensures that the sensor is protected from the outset, eliminating the need for complex mold structures while maintaining adequate protective function.
Solution Approach 2:
The protective projection acts as an intermediary element between the protection cover and the temperature sensor. It provides the necessary protective function by extending outward to contact approaching objects, while the simple mold structure is maintained through the use of straightforward mold removal techniques to create this intermediate protective element.
Data Source
AI summary
An air flow measuring device includes a housing, a sensing part, a temperature sensor, a supporting member, and a protective projection. The housing defines a bypass flow passage which guides a part of air flowing in a duct. The sensing part is disposed in the bypass flow passage to measure a flow rate of air in the bypass flow passage. The sensor detects temperature of air flowing in the duct outside the housing. The supporting member supports the sensor at a predetermined measurement position. The protective projection is a projection, which projects outward from a side surface of the housing and is formed by mold removal in one direction. An end of the protective projection is located outward of the sensor. The protective projection makes contact with an object approaching the sensor from outside the housing to limit contact of the object with the sensor.