Vacuum Pressure Sensor Contamination Shield Design
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Solution Overview
Problem
Existing vacuum pressure sensors in industrial systems face challenges in maintaining measurement accuracy and stability due to contamination from vapors and particulates, which current shielding techniques do not adequately address.
Innovation Solution
A vacuum pressure sensor design that incorporates a contamination shield with a circuitous fluid communication path, where the path crosses the diaphragm plane at least twice, to effectively reduce the likelihood of contaminants reaching the sensing diaphragm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a simple shield barrier is deployed within the sensor cavity to prevent line-of-sight communication of contaminants, then some protection is provided, but significant paths remain around the shield that lead to secondary contamination exposure of the diaphragm
Solution Approach 1:
The shield structure is divided into multiple segments including a primary shield barrier and secondary shielding elements (such as a helical shield or labyrinthine path components) that work together to provide comprehensive protection. This segmentation allows each component to address specific contamination paths while maintaining overall system functionality.
Solution Approach 2:
The shield design extends into multiple spatial dimensions by creating a helical or labyrinthine path that wraps around the diaphragm in three-dimensional space. This multi-dimensional approach blocks contamination paths from all angles rather than providing only planar protection, effectively eliminating secondary contamination exposure while maintaining compact sensor dimensions.
2Object-affected harmful factors
If heated vacuum manometers are used to prevent vapor condensation in the sensor cavity, then contamination from condensation is prevented, but the sensors are more expensive and do not prevent particle contamination
Solution Approach 1:
The shield structure serves as an intermediary physical barrier between the contamination source and the diaphragm. It intercepts and redirects both vapor condensation and particle contaminants along defined paths, preventing them from reaching the sensing element without requiring heating systems or additional filtering components.
Solution Approach 2:
The harmful function of vapor condensation and particle contamination is extracted and redirected along the shielded paths toward collection areas or exhaust, separating these contaminants from the diaphragm measurement zone. This extraction approach eliminates the need for heated systems while maintaining effective contamination prevention.
3Object-affected harmful factors
If discrete in-line filters are utilized to trap particulate contamination in the conduits leading to sensors, then particulate contamination is trapped, but extra system components are involved and vapors are not effectively condensed
Solution Approach 1:
The shield structure merges the functions of particulate filtration and vapor condensation prevention into a single integrated component. The helical or labyrinthine path design simultaneously traps particles through impaction and redirects vapor condensation away from the diaphragm, eliminating the need for separate filters and condensation management systems.
Solution Approach 2:
The shield structure provides multi-functional protection against both particulate and vapor contamination through its geometric design. The same helical or labyrinthine path that traps particles through physical impaction also creates vapor redirection paths, making the shield a universal defense mechanism that handles multiple contamination types without requiring additional specialized components.
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
The contamination shield significantly enhances the isolation of the capacitive structure from contaminants, improving the accuracy and consistency of pressure measurements while maintaining a compact sensor design.
Implementation Method 1
the contamination shield is configured to provide at least one fluid communication path from the inlet to the diaphragm, and wherein each of the at least one fluid communication path crosses the diaphragm plane at least twice
Data Source
AI summary
A vacuum pressure sensor comprises an electrode and a diaphragm forming a capacitive structure. The sensor further comprises a housing defining a sensor cavity and comprising a support structure configured to support the capacitive structure within the sensor cavity. The diaphragm resides in a diaphragm plane and the electrode extends substantially parallel to the diaphragm on a first side of the diaphragm plane. The housing further comprises an inlet disposed on a second side of the diaphragm plane and configured to be in fluid communication with a measured environment. The sensor further comprises a contamination shield, disposed in the sensor cavity between the inlet and the capacitive structure, wherein the contamination shield is configured to provide at least one fluid communication path from the inlet to the diaphragm, and wherein each of the at least one fluid communication path crosses the diaphragm plane at least twice.