Fluid Controller Miniaturization via Sensor Orientation and Casing Thickness
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Solution Overview
Problem
Conventional mass flow controllers face challenges in miniaturization due to the need for smaller pressure sensing surfaces, which reduces sensitivity and mechanical strength, while also facing difficulties in precision and durability during processing.
Innovation Solution
The fluid controller design features a body unit with a pressure sensor attached such that its sensing surface is perpendicular to the component part attachment face, allowing for a larger sensing area and reduced width-direction dimension, while maintaining mechanical strength through uneven lateral wall sections and precise casing formation using a cutting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the pressure sensing surface area is reduced to decrease the width-direction dimension, then the device becomes more compact, but the sensitivity of pressure measurement decreases
Solution Approach 1:
The pressure sensor is reoriented so that its pressure sensing surface extends substantially parallel to the longitudinal direction of the body unit rather than parallel to the component part attachment face. This dimensional reorientation allows the sensing surface to maintain a large area while the device width is reduced, as the sensor protrudes in the longitudinal direction instead of occupying width space.
2Length of stationary object
If the metal plate is thinned to reduce the width dimension of the casing, then the device becomes more compact, but the mechanical strength and processing precision deteriorate
Solution Approach 1:
The lateral walls of the casing are designed with non-uniform thickness: thin sections face the fluid controlling valve and pressure sensor to minimize width dimension in critical areas, while thick sections are provided in other areas to maintain overall mechanical strength and structural integrity. This local differentiation resolves the contradiction between compactness and strength.
3Length of stationary object
If the metal plate is thinned to reduce the width dimension of the casing, then the device becomes more compact, but the processing precision and ease of manufacture deteriorate
Solution Approach 1:
By providing both thin and thick sections in the lateral walls, the design allows standard sheet metal processing methods to be used on thicker sections where precision is critical for structural integrity, while thin sections are only provided where dimensional reduction is essential and do not bear primary structural loads.
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 configuration enables further miniaturization of fluid controllers without compromising sensitivity or mechanical strength, allowing for compact and precise arrangement of multiple units while preventing interference and ensuring durability.
Implementation Method 1
a pressure sensor that is attached to the body unit and detects a pressure in the internal flow path, and a casing that houses therein the fluid controlling valve and the pressure sensor attached to the body unit
Data Source
AI summary
A fluid controller is disclosed, having a body unit, a fluid controlling valve, pressure sensors, and a casing. The fluid controlling valve is attached to a component part attachment face of the body unit. The pressure sensors are attached to the component part attachment face so that the pressure sensing surfaces thereof are positioned substantially perpendicular to the component part attachment face and substantially parallel to the longitudinal direction. On the lateral walls of the casing, the inner surfaces thereof are arranged to be uneven, so that such sections facing the fluid controlling valve and the pressure sensors are arranged to be thin sections, whereas at least a part of such a section that does not face the fluid controlling valve and the pressure sensors is arranged to be a thick section that is thicker than the thin sections.