Housing Partition Seals Flow Path Gaps

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Solution Overview

Problem

Existing physical quantity measurement devices, such as flow rate measurement devices, face accuracy issues due to potential gaps between the housing and sensor support, leading to air leakage or foreign matter contamination, which degrade detection accuracy.

Innovation Solution

The device incorporates a housing partition that protrudes to contact the detection unit, preventing gaps between the measurement flow path and container space, thereby reducing leakage and foreign matter entry.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a flow rate sensor is provided in a bypass flow path, then the flow rate can be detected, but gaps between the housing and sensor support may cause air leakage and foreign matter contamination, degrading detection accuracy

Engineering Contradiction:

Improveflow rate detection accuracyVSAvoidair leakage and foreign matter contamination

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

A seal member is introduced as an intermediary component between the housing and sensor support to prevent gaps. The seal member fills the space between these two components, blocking air leakage paths and preventing foreign matter from entering the measurement flow path, thereby maintaining detection accuracy without compromising the bypass flow path configuration

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The seal member is configured as a flexible ring-shaped component that can deform to fit the interface between the housing and sensor support. This flexible sealing structure effectively closes gaps caused by manufacturing tolerances or assembly variations, preventing air leakage and contamination while accommodating dimensional variations

Inventive Principle:

Principle #30Flexible shells and thin films

2Ease of operation

If the housing and sensor support are assembled, then the sensor can be housed, but gaps may form between components leading to leakage

Engineering Contradiction:

Improvesensor housing assemblyVSAvoidsealing performance

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The seal member serves as a mediator between the housing and sensor support, ensuring reliable sealing without complicating the assembly process. The ring-shaped seal member can be easily positioned in the groove of the housing, and its flexible nature allows it to automatically conform to the interface, maintaining both ease of assembly and sealing reliability

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS11480455B2Physical quantity measurement device

Publication Date: 2022.10.25 DENSO CORP

AI summary

A physical quantity measurement device includes a housing forming a measurement flow path through which the fluid flows and a container space that houses a part of a detection unit. An inner surface of the housing includes a housing intersecting surface that intersects an arrangement direction in which the measurement flow path and the container space are arranged, a housing flow path surface extending from the housing intersecting surface toward the measurement flow path, and a housing container surface extending from the housing intersecting surface toward the container space. The housing includes a housing partition that protrudes from the inner surface toward the detection unit and contacts the detection unit between the housing and the detection unit such that the housing partition separates the measurement flow path and the container space from each other.