Leadless Oil-Filled Pressure Transducer Alignment Glass
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Solution Overview
Problem
Oil-filled pressure transducers experience increased backpressure due to oil expansion with temperature, leading to error signals, and existing designs face challenges in reducing oil volume and maintaining precise alignment of components, making assembly difficult and backpressure reduction inefficient.
Innovation Solution
The use of a leadless sensor secured to a header with a glass pre-form and alignment glass, where the alignment glass is self-locating and has a rectangular cutout to accommodate the sensor die, allowing for a narrow gap between the sensor and metal diaphragm, reducing oil volume and backpressure by minimizing the oil-filled region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the sensor diameter is increased to reduce backpressure, then the backpressure error is reduced, but the assembly difficulty increases due to difficulty in maintaining close separation between metal diaphragm and sensor
Solution Approach 1:
The patent introduces an alignment glass structure as an intermediary component between the sensor and the metal diaphragm. This alignment glass provides a physical reference framework that mediates the positioning relationship, enabling precise alignment and maintaining close separation even at larger sensor diameters where direct alignment would be difficult.
Solution Approach 2:
The alignment glass is pre-formed with specific geometric features (rectangular cutout, self-locating feature) that establish the correct positioning relationships before final assembly. This preliminary structuring of the alignment framework enables easier assembly by pre-defining the spatial relationships that would otherwise be difficult to achieve during assembly.
2Object-affected harmful factors
If the oil volume is reduced to minimize backpressure, then the backpressure error is reduced, but the assembly precision becomes more difficult to maintain
Solution Approach 1:
The alignment glass acts as an intermediary that provides stable geometric references, enabling precise assembly even with minimal oil volume. The self-locating feature and rectangular cutout create defined positioning points that maintain assembly precision without requiring large clearance volumes.
3Object-affected harmful factors
If the gap between sensor and metal diaphragm is narrowed to reduce oil volume, then the backpressure is reduced, but the assembly difficulty increases
Solution Approach 1:
The alignment glass structure serves as a mediator that provides physical guides and references for maintaining the narrow gap. The self-locating feature and rectangular cutout create mechanical constraints that automatically position components at the correct spacing, enabling narrow gap assembly without requiring complex alignment procedures.
Solution Approach 2:
The alignment glass is pre-structured with features that establish the correct gap dimensions before assembly is completed. This preliminary establishment of spatial relationships makes it easier to achieve and maintain the narrow gap required to minimize oil volume and backpressure.
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 design significantly reduces oil volume and backpressure, enhancing assembly precision and accuracy, resulting in a substantial reduction of error signals caused by temperature changes, with backpressure decreased by up to an order of magnitude compared to prior art devices.
Implementation Method 1
The alignment glass has a self locating feature and a rectangular cutout to facilitate easier sensor assembly
Implementation Method 2
when the temperature increases, the oil expands and pushes against the metal diaphragm thus exerting a backpres sure against the sensor
Data Source
AI summary
An oil-filled pressure transducer having reduced back pressure, comprising an alignment plate having a sensor accommodating aperture, a sensor module inserted into the sensor accommodating aperture, a header surrounding the alignment plate, the header having a protruding top surface, and a diaphragm disposed on the protruding top surface to create a relatively small oil accommodating region between the diaphragm and the sensor. This configuration reduces the oil volume required for operation, which ultimately reduces the back pressure applied against the diaphragm.