Housing Air Reservoir Thermal Pumping for Sensor Protection
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Solution Overview
Problem
Housings for sensors or actuators are vulnerable to aggressive ambient conditions, which can lead to deterioration of both the housing and the elements within, especially in environments with fluctuating temperatures and fluids.
Innovation Solution
A housing design with a chamber that connects to the ambient environment via an opening and an air reservoir, utilizing temperature changes to pump air in and out, ensuring air exchange and protection against fluid exposure through non-return valves and a fluid-tight connection, allowing for ventilation and mixing of fresh air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple housing design is used, then the device complexity is reduced, but the protection against aggressive ambient conditions deteriorates
Solution Approach 1:
The housing is divided into two separate chambers: a first chamber for the sensor and a second chamber for the actuator. This segmentation allows each chamber to be optimized independently for its specific element's protection requirements, improving overall reliability without excessive complexity
Solution Approach 2:
A diaphragm is introduced as an intermediary component between the first and second chambers. This diaphragm mechanically couples the chambers while maintaining their separation, allowing force transmission while protecting sensitive elements from direct exposure to aggressive conditions
2Reliability
If the housing is sealed completely, then protection against fluid exposure is improved, but air exchange and temperature regulation deteriorate
Solution Approach 1:
A flexible diaphragm is used to separate the chambers while allowing controlled interaction. The diaphragm can deform to allow pressure equalization and air exchange while maintaining fluid tightness, thus protecting against fluid exposure while enabling temperature regulation through air exchange
Solution Approach 2:
The air exchange function is extracted from the main housing structure and implemented through a separate ventilation system with controllable openings. This allows the housing to remain sealed against fluids while providing controlled air exchange paths for temperature regulation
3Adaptability or versatility
If a complex ventilation system is used, then air exchange is improved, but the device complexity increases
Solution Approach 1:
The ventilation system utilizes natural convection currents created by temperature differences between the interior and exterior environments. This self-service approach enables air exchange without requiring active fans or complex control mechanisms, maintaining simplicity while achieving effective ventilation
Solution Approach 2:
The ventilation openings are designed to dynamically adjust their effective area based on pressure differences and temperature gradients. This dynamic behavior allows the system to adapt to varying environmental conditions automatically, improving air exchange efficiency without adding complex control systems
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 effectively maintains a stable and fresh air environment within the housing, protecting elements from adverse conditions such as fluid exposure and temperature fluctuations, enhancing the robustness of the housing for use in aggressive environments like urea tanks in vehicles.
Implementation Method 1
The reservoir, the first valve and the second valve are embodied to pump air from the ambient through the chamber if a temperature of the reservoir changes
Data Source
Figure 1~3
Figure 4~7
AI summary
Arrangement with a housing (1) for an element (3) for example a sensor or an actuator, wherein the housing (1) has a chamber (2) for the element, wherein the housing (1) has an opening (4), wherein the opening (4) connects the chamber (2) with an ambient (5), wherein a reservoir (6) is connected via a first valve (7) and a line (8) with the chamber (2), wherein the reservoir (6) is connected via a second valve (9) with the ambient (5), wherein the reservoir (6) and the first valve (7) and the second valve (9) are embodied to pump air from the ambient (5) through the chamber (2) if a temperature of the reservoir (6) changes.