Pressure Compensation Unit With Filter Diaphragm
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Solution Overview
Problem
Existing pressure compensation units in pressure sensors require large installation space and are prone to capillary effects, which can lead to fluid and contaminant accumulation, impairing functionality.
Innovation Solution
A pressure compensation unit with a housing featuring a continuous channel and a gas-permeable, fluid-tight filter diaphragm that allows ambient air to flow through, connected to a reference pressure chamber via an air passage, preventing fluid entry while minimizing installation space and protecting against mechanical damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional pressure compensation unit with a gas-permeable filter diaphragm is used, then pressure compensation and protection against contaminants are achieved, but the installation space required is large
Solution Approach 1:
The patent uses a membrane (film) as the pressure compensation element instead of a rigid structure. This flexible membrane allows pressure equalization while occupying minimal space, directly resolving the contradiction between compact size and functional effectiveness.
Solution Approach 2:
The patent employs a porous membrane structure that allows gas permeation while blocking liquids and contaminants. The porous nature enables pressure compensation functionality without requiring large openings that would cause capillary effects, thus achieving both compact size and reliability.
2Volume of moving object
If the opening of the pressure compensation unit is reduced to minimize installation space, then compact design is achieved, but capillary effects occur causing liquid and contaminant accumulation
Solution Approach 1:
The membrane structure replaces rigid openings, allowing the system to maintain compact dimensions while the flexible nature of the membrane prevents capillary action that would occur with small fixed openings.
Solution Approach 2:
The porous membrane provides controlled permeability that prevents capillary effects. The pore structure allows gas passage while the surface tension properties of the porous material prevent liquid accumulation, eliminating the harmful capillary effects associated with reduced openings.
3Reliability
If the filter diaphragm is exposed to the environment for gas exchange, then pressure compensation is effective, but the filter diaphragm is vulnerable to mechanical damage
Solution Approach 1:
The membrane is nested within the housing structure, which provides mechanical protection. The housing acts as a protective shell that shields the vulnerable membrane from external mechanical damage while allowing the membrane to perform its pressure compensation function.
Solution Approach 2:
The membrane's flexible nature allows it to be integrated into the housing in a protected manner, maintaining its gas-permeable functionality while the housing structure provides the mechanical strength needed to protect against damage.
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 design provides efficient pressure compensation with reduced installation space, preventing capillary effects and ensuring the filter diaphragm's protection against contaminants and mechanical damage, while maintaining effective gas exchange.
Implementation Method 1
at least one opening, for example a round or polygonal opening, is provided in a wall of the channel. This opening is connectable and/or is connected to a reference pressure chamber of the pressure sensor via at least one air passage in the housing. The opening is closed by at least one gas-permeable and preferably fluid-tight filter diaphragm
Data Source
AI summary
A pressure compensation unit for use in a pressure sensor includes a housing which has at least one continuous channel, at least one opening being provided in a wall of the channel. The opening is connectable to a reference pressure chamber of the pressure sensor via at least one air passage in the housing. The opening is closed by at least one gas-permeable and preferably fluid-tight filter diaphragm.