Pressure Measuring Housing With Drip-Edge Venting Sleeve
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing venting sleeves in pressure measuring devices are prone to the 'teapot effect' during cleaning, where cleaning liquid does not drip off completely, potentially blocking air exchange openings and impairing functionality.
Innovation Solution
A narrow, circumferential expansion is integrated into the protective cap of the venting sleeve, forming a drip edge that directs liquid away from the air exchange openings, preventing liquid ingress and ensuring continuous dripping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a venting sleeve with lateral openings is used for air exchange, then pressure equalization is achieved, but cleaning liquid can flow along the side surfaces and block the openings
Solution Approach 1:
The venting sleeve is segmented into distinct functional zones: an upper portion with lateral openings for air exchange and a lower portion with a circumferential expansion forming a drip edge. This segmentation allows the upper portion to maintain pressure equalization while the lower portion with the drip edge prevents liquid from reaching and blocking the openings.
Solution Approach 2:
The solution introduces a vertical dimensional feature (the circumferential expansion forming a drip edge at the lower portion) to address a horizontal problem (liquid flowing along side surfaces). The drip edge creates a vertical barrier that redirects liquid flow away from the lateral openings, solving the blocking problem while preserving air exchange functionality.
2Strength
If the venting sleeve is designed as a protective cap, then the membrane is protected from direct jet impact, but the teapot effect occurs during cleaning
Solution Approach 1:
The protective cap is segmented into an upper portion with lateral openings and a lower portion with a circumferential expansion. This segmentation allows the upper portion to provide membrane protection while the lower portion with the drip edge prevents liquid accumulation and the teapot effect during cleaning operations.
Solution Approach 2:
The circumferential expansion at the lower portion, which initially might be seen as an unnecessary structural complexity, actually serves a beneficial function by forming a drip edge that actively prevents liquid from reaching the openings. This structural feature converts what could be seen as a potential weakness into a strength by actively managing liquid flow during cleaning.
3Ease of operation
If a circumferential expansion is added to form a drip edge, then liquid drainage is improved, but device complexity increases
Solution Approach 1:
Instead of making the entire venting sleeve complex, the circumferential expansion is applied locally only at the lower portion where it is needed to form the drip edge. The upper portion with lateral openings remains relatively simple, maintaining ease of manufacture while providing improved liquid drainage functionality where required.
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
Prevents the teapot effect by ensuring complete liquid drainage, maintaining effective air exchange and reducing residual liquid on the device during cleaning.
Implementation Method 1
The narrow, circumferential expansion here represents a kind of grommet in which a liquid located in the downwardly oriented area of the venting sleeve would be forced to flow upward after passing around the defined tear-off edge created by the expansion, but this is prevented by gravity. As a result, the liquid drips off the narrow expansion.
Data Source
AI summary
The invention relates to a housing comprising a venting device (10) which is arranged on the housing (2) and which allows an ambient pressure to be supplied to the interior of the housing (2). The venting device (10) is made of a sleeve-like protective cap (11) with lateral openings (12) and a liquid-repellant membrane, and a cavity for receiving the membrane is formed in the interior of the venting device (10). The membrane is arranged such that an opening, which is provided for the pressure supply, in the wall of the housing (2) is covered. In order to prevent the so-called teapot effect and therefore allow a light dripping of a liquid on the venting device (10), the sleeve-like protective cap (11) has a narrow circumferential expansion (14) in the region of the lateral surface of the protective cap such that a defined dripping edge is formed.