Fluid Pump Controller Sealing With Pressure-Responsive Venting
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Solution Overview
Problem
Existing electronically commutated fluid pumps face challenges in maintaining robustness and efficiency under harsh environmental conditions, particularly due to inadequate ventilation systems that are costly and prone to failure when exposed to extreme temperatures, vibrations, and other external hazards, which affect the lifespan and functionality of integrated controller assemblies.
Innovation Solution
A sealing arrangement with an endless groove and gasket design that incorporates a venting element, allowing passive ventilation by moving between closed and open positions based on internal and external pressure differentials, without requiring additional components or assembly steps, ensuring effective sealing and ventilation of the controller assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If passive ventilation uses non-mechanical design elements such as ventilation holes, then the PCB device is cooled and pressure is equalized, but the system lacks robustness in harsh environmental conditions
Solution Approach 1:
The venting element automatically responds to pressure differentials between the internal chamber and external environment, opening to vent pressure when internal pressure exceeds external pressure, and closing when external pressure is greater, without requiring external control systems or additional components
Solution Approach 2:
The venting element transitions between static sealed and dynamic venting states based on real-time pressure conditions, allowing the sealing arrangement to adapt its ventilation characteristics to environmental conditions rather than maintaining a fixed state
2Quantity of substance
If a ventilation hole covered with a plastic sticker is used, then the PCB cavity pressure is relieved, but the system lacks robustness and requires additional assembly steps
Solution Approach 1:
The venting element is integrated into the gasket structure itself, combining the sealing function of the gasket with the venting function in a single component rather than using separate sticker and hole elements
Solution Approach 2:
The gasket serves multiple functions simultaneously: sealing the interface between housing and cover, providing a pathway for the venting element, and enabling pressure-responsive ventilation, eliminating the need for dedicated venting components
3Reliability
If the venting element is in the closed position, then sealing is maintained, but pressure buildup occurs inside the housing chamber
Solution Approach 1:
The venting element responds to feedback from internal pressure conditions, automatically opening when the pressure differential exceeds a threshold and closing when pressure equalizes, creating a self-regulating pressure management system
4Stress or pressure
If the venting element is in the open position, then pressure is equalized, but sealing effectiveness is reduced
Solution Approach 1:
The venting element dynamically adjusts its state based on pressure conditions, being open only when needed for pressure equalization and closed when sealing is prioritized, rather than maintaining a fixed open or closed state
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 solution provides reliable sealing and ventilation of the controller assembly, enhancing the pump's durability and efficiency while reducing costs by eliminating the need for extra components and assembly steps, thus improving the pump's performance in adverse conditions.
Implementation Method 1
The venting element is movable between a closed position in which the lip of the venting element seals against the sealing surface of the gland and an open position in which the lip is spaced from the sealing surface to allow for communication of fluid from the housing chamber to outside of the housing. The venting element is in the closed position when an external pressure outside of the housing is greater than an internal pressure in the housing chamber, and the venting element is in the open position when the internal pressure in the housing chamber is greater than the external pressure outside of the housing.
Data Source
AI summary
A sealing arrangement for an electronically commutated fluid pump is provided. The sealing arrangement includes a gland formed in a housing outer face surface and connected to an endless groove in the housing. The gland includes a vent passage and a sealing surface that defines a depression in the outer face surface. The vent passage connects an internal chamber of the housing in fluid communication with the depression. A gasket including a venting element is received in the endless groove such that the venting element is disposed in the gland. The venting element is movable between a closed position in which a lip seals against the sealing surface and an open position in which the lip is spaced from the sealing surface allowing communication of fluid from the housing chamber to the outside. An integrated controller assembly and fluid pump including the sealing arrangement are also provided.